<div nz-row class="mb30">
  <button nz-button nzType="primary" nzSize="large" nzShape="circle" (click)="backward()">
    <i nz-icon nzType="arrow-left" nzTheme="outline"></i>
  </button>
</div>

<div nz-row>
  <nz-card [nzBordered]="false" nzTitle="服务器" [nzExtra]="extraTemplate">
    <nz-empty></nz-empty>
  </nz-card>
  <ng-template #extraTemplate>
    <button nz-button nzType="primary" nzSize="large" nzShape="circle" (click)="add()">
      <i nz-icon nzType="plus" nzTheme="outline"></i>
    </button>
  </ng-template>
</div>
